That was very clever by them with the whole HP thing and figuring out the order of the worlds. I'm not gonna lie, I already figured that the Volcano chapter would be last, since Bowser is the main enemy again in this game.

Also, what if Kersti is actually one of the Royal Stickers, since it appears as if she belongs to Peach? It could be like in the past two games, when you obtain one of the main things (Crystal Stars, and Pure Hearts) right at the beginning of the game? It's just a thought.